2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
104 lines
2.4 KiB
C
104 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* ECB: Electronic CodeBook mode
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*
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* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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*/
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#include <crypto/algapi.h>
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#include <crypto/internal/skcipher.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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static int crypto_ecb_crypt(struct skcipher_request *req,
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struct crypto_cipher *cipher,
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void (*fn)(struct crypto_tfm *, u8 *, const u8 *))
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{
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const unsigned int bsize = crypto_cipher_blocksize(cipher);
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struct skcipher_walk walk;
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unsigned int nbytes;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while ((nbytes = walk.nbytes) != 0) {
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const u8 *src = walk.src.virt.addr;
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u8 *dst = walk.dst.virt.addr;
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do {
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fn(crypto_cipher_tfm(cipher), dst, src);
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src += bsize;
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dst += bsize;
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} while ((nbytes -= bsize) >= bsize);
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err = skcipher_walk_done(&walk, nbytes);
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}
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return err;
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}
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static int crypto_ecb_encrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
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return crypto_ecb_crypt(req, cipher,
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crypto_cipher_alg(cipher)->cia_encrypt);
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}
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static int crypto_ecb_decrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
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return crypto_ecb_crypt(req, cipher,
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crypto_cipher_alg(cipher)->cia_decrypt);
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}
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static int crypto_ecb_create(struct crypto_template *tmpl, struct rtattr **tb)
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{
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struct skcipher_instance *inst;
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struct crypto_alg *alg;
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int err;
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inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
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if (IS_ERR(inst))
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return PTR_ERR(inst);
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inst->alg.ivsize = 0; /* ECB mode doesn't take an IV */
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inst->alg.encrypt = crypto_ecb_encrypt;
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inst->alg.decrypt = crypto_ecb_decrypt;
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err = skcipher_register_instance(tmpl, inst);
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if (err)
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inst->free(inst);
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crypto_mod_put(alg);
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return err;
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}
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static struct crypto_template crypto_ecb_tmpl = {
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.name = "ecb",
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.create = crypto_ecb_create,
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.module = THIS_MODULE,
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};
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static int __init crypto_ecb_module_init(void)
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{
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return crypto_register_template(&crypto_ecb_tmpl);
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}
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static void __exit crypto_ecb_module_exit(void)
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{
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crypto_unregister_template(&crypto_ecb_tmpl);
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}
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subsys_initcall(crypto_ecb_module_init);
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module_exit(crypto_ecb_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("ECB block cipher mode of operation");
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MODULE_ALIAS_CRYPTO("ecb");
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